EP1166902A2 - Device for cleaning crates - Google Patents

Abstract

In the case of a device for cleaning boxes (2, 2a), a conveyor section (9, 10, 11) is provided in an interior or treatment room (4), on which the boxes (2, 2a) for treatment with a liquid cleaning medium flow into a Conveying direction (A) can be moved. The conveyor section (9, 10, 11) has at least one upward turner (15) in which the boxes (2,2a) are turned around an axis (31) running parallel to the transport plane (TE).

Description

The invention relates to a device according to the preamble of claim 1.

Devices for cleaning boxes, in particular bottle boxes, are known. A device (DE 44 00 871-A1) is also known in which the cleaning boxes on a conveyor through the interior of a housing be moved on the handling of the boxes with different aqueous Treatment or cleaning media takes place and the u.a. of horizontal conveyor or Transport routes is formed, which in turn or upward in Form of jaw conveyors are interconnected.

The object of the invention is to show a device for cleaning boxes, which enables intensive cleaning of boxes of different sizes allows. To solve this problem, a device is according to the Claim 1 trained.

The invention allows i.a. an adaptation of the Device or its conveyor on boxes of different sizes and / or Height. Different designs are available for the device according to the invention conceivable.

For example, at least one arranged above the transport level, in Transport direction (A) extending guide element for the boxes on one of the Transport plane facing away from the side provided, namely with a first adjustment or Lifting device to adjust the height of the distance that the Has guide element from the transport level, is adjustable, namely preferably from the outside of the housing.

In a further embodiment of the invention, the at least one is in the conveying direction Transport route preceding the upward or reversing conveyor is provided in which the boxes one parallel to the transport plane and perpendicular to the Conveying direction axis are turned, with the transition between a box guide (32) is provided for the upward conveyor and the transport route, the at least one, for example formed by at least one slide rail Sliding element for the side of the boxes facing the transport plane forms over the the boxes slide from the upward conveyor onto the transport level of the transport route and that with one end extends at least to an exit of the upward conveyor and is arranged with another end in the region of the transport route, and the sliding element at one end by a second adjusting device is adjustable relative to the transport level.

In a further embodiment of the invention there are at least two in the housing Transport or conveyor routes are formed, which are one by one Clamp jaw conveyors formed upward or reversing conveyors with each other are connected, the conveyor width by adjusting the distance between the two Elements of the respective jaw conveyor is changeable, a third Adjustment device is provided with the lateral guide railing at least one the conveyor lines are adjustable with the elements of the jaw conveyor.

Fig. 1

in vereinfachter schematischer Darstellung und im Längsschnitt eine Flaschenkasten-Reinigungsmaschine gemäß der Erfindung;

Fig. 2

in vergrößerter Teildarstellung eine in der Höhe einstellbare und als Niederhalter dienende obere Führungsschiene;

Fig. 3

in vergrößerter Darstellung einen Schnitt entsprechend der Linie I - I der Figur 2;

Fig. 4

im Detail und in Seitenansicht eine der Umlenkrollen einer Verstellvorrichtung für den Niederhalter der Figur 2;

Fig. 5

in Teildarstellung das obere Ende eines der beiden Wende- oder Aufwärtsförderer, zusammen mit einer einstellbaren unteren Kastenführung am Übergang zwischen dem Wende- oder Aufwärtsförderer und der anschließenden horizontalen Förderstrecke;

Fig. 6

einen Schnitt entsprechend der Linie II - II der Figur 5;

Fig. 7

in Teildarstellung eines der beiden einstellbaren seitlichen Führungsgeländer einer horizontalen Förderstrecke der Reinigungsmaschine der Figur 1.

Developments of the invention are the subject of the dependent claims. The invention is explained in more detail below with reference to the figures using exemplary embodiments. Show it:

Fig. 1

in a simplified schematic representation and in longitudinal section a bottle crate cleaning machine according to the invention;

Fig. 2

an enlarged partial representation of an upper guide rail which is adjustable in height and serves as a hold-down device;

Fig. 3

an enlarged view a section along the line I - I of Figure 2;

Fig. 4

in detail and in side view one of the deflection rollers of an adjusting device for the hold-down device of FIG. 2;

Fig. 5

in partial representation, the upper end of one of the two reversing or upward conveyors, together with an adjustable lower box guide at the transition between the reversing or upward conveyor and the subsequent horizontal conveyor line;

Fig. 6

a section along the line II - II of Figure 5;

Fig. 7

in partial representation of one of the two adjustable lateral guide rails of a horizontal conveyor path of the cleaning machine of FIG. 1.

The one shown in the figures and generally designated 1 there Cleaning machine is used to clean boxes 2 and 2a, which are used to hold Containers, for example bottles (box 2) or cans (box 2a) are intended. The machine 1 essentially consists of an elongated or cuboid housing 3, which has an interior or treatment room 4th encloses in which the for washing and cleaning the boxes 2 and 2a necessary functional elements and units (especially immersion bath and Spray nozzles) are housed. The interior 4 is not, for example illustrated, provided on one long side of the housing 3, i.e. Man - sized doors with large windows through which the way the Machine 1 can be monitored easily and clearly.

Between one on the left in FIG. 1 end face 5 of the housing 3 in the lower Area provided box inlet 6 and one on the right in this figure End face 7 provided in the upper area box outlet 8 is one at the shown embodiment formed single-track conveyor on which to cleaning boxes 2 and 2a through the interior 4 and at the Conveyor formed treatment or washing elements moved past become.

As is also shown in FIG. 1, this conveyor device consists of essentially of three arranged vertically above one another in the vertical direction horizontal conveyor lines 9 - 11, on which the boxes moved in the conveying direction A. are and of which the lowest conveyor section 9 is designed as an immersion bath in which the boxes 2 and 2a to be cleaned in a cleaning liquid to be submerged. The middle transport route 10 and the upper transport route 11 are each of independent, endlessly driven conveyor chains 12 (Figure 6) formed, each with its upper, horizontal length a footprint for the boxes 2 and 2a form and the transport level TE of the transport route define.

The conveyor lines 10 and 11 continue to have each on the long sides lateral guide railing 13, which extends in the horizontal direction along the concerned transport route extends parallel to the direction of conveyance A. As Hinged belt chains designed conveyor belts 12 are each driven so that the necessary conveying direction A results for boxes 2 and 2a, i.e. at the for 1 selected representation on the transport route 10 from right to left and on the transport route 11 from left to right.

Between the transport route 9 and the transport route 10 and the Transport route 10 and the transport route 11 is in each case a turning or Upward conveyors 14 and 15 are provided, in which the boxes 2 and 2a are turned be, so that in the illustrated embodiment, the boxes on their bottom are fed up the box inlet 6, which is designed as an immersion bath Run through transport route 9 in this orientation, then via the upward conveyor 14 turned, i.e. with the box floor lying on top of the transport route 10 are handed over and turned again from there via the upward conveyor 15, again with the floor below on the transport route 11 to the Box outlet 9 arrive.

On the transport routes 10 and 11 and also on the up conveyors 14 and 15 are for treating the boxes, among other things, spray nozzles 16 for the respective Washing or treatment liquid (water with cleaning additives as well Fresh water for rinsing, etc.) is provided.

The upward conveyors 14 and 15 are each designed as jaw conveyors, in which the boxes 2 and 2a are held laterally by clamping on clamping jaws, the driven on revolving and guided on frames or supports 43 Jaw bands 44 are provided (Fig. 7). Such jaw conveyors are known to the person skilled in the art.

On the transport routes 10 and 11, but also on the transport route 9 in each case an upper guide rail (guide rail) serving as a hold-down device 17 provided, which is above the respective transport route in a Transport direction A including vertical central plane M is provided.

As also shown in Figure 1, the boxes 2 and 2a have different Size and height, with the boxes 2 usual in the embodiment shown Bottle crates for holding beverage bottles and the crates 2a from one suitable material, for example trays made of plastic for holding Cans are.

In order to use the same machine to make boxes of different sizes or heights, For example, to be able to treat boxes 2 and 2a, and a quick one Convert the machine 1 from one box height to another box height enable the guide railings 17 to be adjusted in height via an adjusting device, i.e. adjustable in the vertical direction, as shown in the figures with the double arrow B is indicated.

The adjustment device provided for this height adjustment is in more detail in Figures 2 and 3 reproduced and generally designated 18 there. For each Guide railing 17 is a separate one in the illustrated embodiment Adjustment device 18 is provided. This essentially consists of one upper, designed as a rod lifting rail 19, which is shown in the Embodiment formed by a C or U profile and above the associated one Guide rail 17 is arranged such that the open side of this profile after below, i.e. points in the direction of the guide rail 17. The lifting rail 19 with their longitudinal extent parallel to the associated guide rail 17 and together with this in the central plane M is in the longitudinal direction, i.e. in horizontal direction parallel to the conveying direction A by a predetermined stroke (Double arrow C) slidable. For this purpose, a frame 20 of the housing 3 several rollers 21 freely rotatable about axes perpendicular to the central plane M, and on flat arms 22 projecting downward from frame elements 20 Rollers 21 is the rail 19, between the arms 22 and thus through secured against slipping down sideways.

On the adjusting or lifting rail 19 there are several chains designed as roller chains 23 each fastened with one end, in the embodiment shown in each adjusting device 18 a total of three chains at regular intervals such that there is a chain 23 in the region of each end of the rail 19 or the associated guide rail 17 and a chain 23 in the middle of each Rail 19 or guide rail 17 is located. Each chain 23 is with her upper end between the legs of the U or C profile of the lifting rail 19th held (attachment point 24) and via this attachment point 24 adjacent roller 21 guided so that each chain 23 down over this roller 21 hangs. Each chain 23 is still with its lower end at 25 at the top of the associated guide rail 17 attached.

As can be seen in Figure 1, all chains 23 extend each lifting or Adjustment device 18 each in the same direction via its fastening point 24 adjacent role 21, specifically in the illustration selected for FIG. 1 starting from the upper attachment point 24 counterclockwise by about a quarter of the scope of the associated role 21. Furthermore, the arrangement is so hit that in the one end position of the stroke C, the lowest position of the Guide rail 17 corresponds to the upper attachment point 24 on the roller 21 or is in close proximity to this role while in the other Extreme position of the stroke C, the upper position of the guide rail 17th corresponds, the upper attachment point 24 from the associated roller 21 one has a greater distance. In both cases, the respective chain 23 is over the associated role 21 performed.

The formation of the lifting rail 19 as a C or U profile and the attachment of the chains 23 inside this profile have the advantage that the lifting rail 19 on the rollers 21 rests and the chains 23 are also guided over the same rollers 21. Instead of of the C-profile can also be another profile, for example a for the lifting rails 19 Solid profile or a tubular profile with a square or rectangular cross-section be used, this profile then in the region of the rollers 21 with a is open towards the bottom recess for the chains 23 such that in A U- or C-shaped cross section is obtained in the region of the recess. Still is it is possible to provide the rollers 21 with a circumferential groove for the chains 23, the respective lifting rail then lies laterally from this groove on the roller.

Via a drive, for example a cable 26, the respective Lifting rail 19 in the direction of the double arrow C by turning one of the Outside of the housing 3 provided dial 27 shifted and thus the Height of the associated guide rail 17 can be set. In the illustrated The embodiment is for each adjustment device 18 with its own setting wheel 27 associated drive or cable 26 provided. Basically, there is also Possibility of all adjustment devices 18 via a common actuator, for example setting wheel 27 to operate. Of course, this setting can also by motor, for example by an electric motor or another motor Actuator or drive take place.

The guide rails 17 are in the illustrated embodiment when the Boxes 2 and 2a come into contact with these guide rails with their Mass weight against the boxes and exist in the illustrated Embodiment with a hollow or tubular profile closed on the circumference square cross section.

At least at the front end in relation to the conveying direction A is on everyone Guide rail 17 a shorter guide rail 17a hinged at one end (Joint 28) and articulated at the other end (joint 29) with one at the Housing 3 or connected to a frame part 20 provided there bearing 30, in such a way that the longitudinal extension of the guide rail 17a of the common Middle plane M lies with the longitudinal extent of the associated guide rail 17.

The joint 28 is designed so that there is a pivoting between the Allows guide rails 17 and 17a about an axis perpendicular to the center plane M. The joint 29 formed on the bearing 30 is designed so that it pivots an axis perpendicular to the central plane M and at the same time also a radial one Allows moving in the horizontal direction. In the illustrated In one embodiment, the hinge 29 is a pin-slot joint.

On the one hand, the guide rails 17a prevent bottle crates 2 or 2a at the beginning of the respective guide rail 17 by possibly Blocking against the end of this guide rail there, i.e. by the guide rails 17a become those in the respective conveyor section 9, 10 and 11 incoming boxes 2 and 2a thus reliably under the associated guide rail 17 headed. At the same time, the guide rails 17a also stabilize the associated guide rail 17 is reached, in particular also against one unwanted oscillation around an axis parallel to the conveying direction A. By the Joints 28 and 29 is a despite the respective guide rail 17a Height adjustment of the guide rail 17 possible in the manner described above. The guide rails 17a also each consist of a tubular profile square cross section.

As Figure 1 shows, the boxes 2, 2a, which have a very different height can have, from the transport route 10 to the subsequent Upward conveyor 15 passed in a position that corresponds to the positioning of this Boxes on the transport route 10 corresponds to, i.e. the boxes are with their open Side in the area of the upward conveyor 15 lying outside with a radial distance from the central axis 31 of the semicircular path of movement Upward conveyor arranged (radial distance) corresponds to the distance that the Transport or conveying plane of the transport route 10 from this central axis 31 having. The transport or conveying plane of the transport route 11 lying above it but has a much smaller distance from the central axis 31, the Difference of these distances is slightly larger than the greatest height of the processed Boxes.

Not only the boxes 2 of greater height, but also the boxes 2a of lower height To be able to process gently and quietly is at the transition between the upward conveyor 15 and the transport path 11 an adjustable box guide 32 provided over which the boxes 2 and 2a with their underside sliding on the Conveyor belt or on the flat top chain 12 of the transport route 11 and through which a gentle and in particular also low-noise transfer of Boxes of smaller height, for example boxes 2a, are reached.

At the transition between the up conveyor 14 and the transport route 10 is at in the embodiment shown, such a box guide 32 is not required, since it is assumed that boxes 2 or 2a move through the transport path 9 designed as an immersion bath in the cleaning liquid there float up and over the guide rail 17 there with its open top be kept at a level whose distance from the central axis 31 of the Upward conveyor 14 is equal to or approximately equal to the distance that the Transport plane of the transport route 10 from this central axis 31. Basically, there is the possibility, also at the transition between the Upward conveyor 14 and the transport route 10 such a box guide 32nd provided.

The box guide 32 consists essentially of two of a tube profile formed slide rail 33, each at one end by means of a joint 34 a frame 35 of the transport route 11 are articulated, that is pivotable about a horizontal axis perpendicular to the central plane M or to the direction of transport A. The frame 35 forms the guide for the flat top chain 12 and the storage for the guide and deflection wheels of this chain.

The joints 34 of the two slide rails 33 are arranged axially. With her free, curved ends extend the slide rails 33 into the upward conveyor 15 into it. The slide rails 33 are on both sides of the flat top chain 12 intended. Approximately in the middle are the two slide rails 33 on the underside a crossbar 36 connected with its longitudinal extent parallel to the axis of Joints 34 lies. At the ends of the crossbar 36 is in each case by means of a joint 37 a lever 38 is articulated at one end, the other end by means of a joint 39 is articulated on an arm 40 'of an angle lever 40. The angle lever 40 is by means of a joint 41 is articulated on a frame part 20 of the housing 3. The free end the other arm 40 "of the angle lever 40 is via a tension member 42 with the Lifting rail 19 connected to the adjustment device 18 with which the Height adjustment of the guide rail 17 of the underlying transport route 10 he follows.

The lever 38 and the arms 40 'and 42 "of the angle lever 40 lie in one plane parallel to the central plane M. The joints 37, 39 and 41 lie with their joint axes perpendicular to this median plane. The arrangement is still such that when Adjustment of the lifting rail 19 for the guide rail 17 of the transport route 10 in In order to lower this guide rail 17, the two slide rails 33 around the Joints 34 are pivoted with their free ends upwards or at one Raising the mentioned guide rail 17 swiveling the slide rails 33 downwards. This means that depending on the setting of the Guide rail 17 of the transport route 10 preceding the upward conveyor 15 the box guide 32 provided at the output of the upward conveyor 15 automatically correctly adjusted to the height of boxes 2 and 2a such that the distance between the free Ends of the slide rails 33 from the central axis 31 approximately the same or slightly is greater than the distance between the guide rail 17 and the guide rail which is adjusted 10 from the associated transport level TE and thus within the Upward conveyor 15 boxes still held before transfer to the transport route 11 slide with their bottom on the curved ends of the slide rails 33 and then gently and almost silently along the slide rails 33 on the Arrive transport route 11.

The setting of the box guide 32 thus takes place via the common setting element for the height adjustment of the guide rail 17 of the box guide 32 in Transport direction A preceding transport route 10.

To be able to process boxes 2 and 2a, horizontally and transversely to the conveying direction A have different widths, it is common and known that Adjust conveyor width of the upward conveyor 14 or 15, respectively by Adjust the two frame parts 43 of the respective upward conveyor vertically and symmetrical to the center plane M. On the frame parts 43 are the jaws forming conveyor belts 44 out. This adjustment is carried out via spindles 45 can be operated via a common drive, for example via a manual one Drive on the outside of the housing 3. In order to adjust the conveying width of the Upward conveyor 14 and 15 also a width adjustment at least the Transport routes 10 and 11 or the guide rail 13 there can be reached each guide railing 13 at both ends via a lever arrangement 46 with a Frame element 43 is drivingly connected.

The lever arrangement 46 consists of a lever 47, which over that of the respective Transport route 10 or 11 facing away from the outside of the guide railing 13 obliquely stands out and at one end by means of a hinge 48 on the guide rail and the other end by means of a joint 49 on a frame part 20 of the housing 3 is articulated. In the middle is the lever 47 via a joint 50 with one end Control lever 51 connected, the other end via a hinge 52 with the Frame part 43 is articulated. The joint axes of the joints 48, 49, 50 and 52 are vertical axes, respectively. When adjusting the conveyor width of the Upward conveyor 14 or 15 (double arrow D) is on the control lever 51 associated lever 47 for width adjustment of the side guide railing 13 pivoted. This is via several levers 47a corresponding to lever 47 Guide railing 13 supported between its two ends in the housing 3.

Like the other functional elements provided in the interior 4, are in particular the guide rails 17, 17a and the elements of the Adjustment device 18, the box guide 32 and the elements of Lever assemblies 46 made of corrosion-resistant material, preferably made of stainless steel or corrosion-resistant steel. The roles 21 of the Adjustment devices 18 are preferably made of a suitable plastic.

The invention has been described above using an exemplary embodiment. It it goes without saying that numerous changes and modifications are possible without that this leaves the inventive idea on which the invention is based.

LIST OF REFERENCE NUMBERS

1

Cleaning or washing machine

2, 2a

box

3

casing

4

inner space

5

front

6

box inlet

7

front

8th

box outlet

9, 10, 11

transport distance

12

Conveyor belt or hinge chain

13

guide railings

14, 15

upward conveyor

16

nozzle

17, 17a

guide rail

18

Adjustment or lifting device

19

lifting rail

20

frame element

21

role

22

poor

23

Chain

24, 25

attachment point

26

rope

27

dial

28, 29

joint

30

camp

31

central axis

32

box guide

33

slide

34

joint

35

frame

36

crossmember

37

joint

38

lever

39

joint

40

bell crank

40 ', 40 "

poor

41

joint

42

tension member

43

frame

44

Transport or clamping band

45

adjusting spindle

46

lever assembly

47, 47a

lever

48, 49, 50

joint

51

control lever

52

joint

A

conveying direction

B, C, D

double arrow

M

midplane TE transport plane

Claims (13)

Device for cleaning boxes (2, 2a), in particular those for bottles, cans or similar containers with at least one conveyor line (9, 10, 11) formed in an interior or treatment room (4), on which the boxes (2, 2a ) for treatment with a liquid cleaning medium are moved in a conveying direction (A) on a transport plane (TE), at least one upward or reversing conveyor (15) being provided, in which the boxes (2, 2a) are arranged parallel to the transport plane ( TE) and axis (31) extending perpendicular to the conveying direction (A), characterized in that at least part of the conveying path (9, 10, 11) can be adjusted in height and / or width and / or in height. Apparatus according to claim 1, characterized by at least one guide element (17, 17a) for the boxes (2, 2a) arranged above the transport plane and extending in the transport direction (A) on a side facing away from the transport plane, and by a first adjusting or lifting device ( 18, 26, 27) with which the distance that the guide element (17), for example formed by a guide rail, from the transport plane (TE) can be set, preferably from the outside of the housing (3). Apparatus according to claim 1 or 2, characterized in that in the conveying direction (A) of the at least one transport path (11) preceding the upward or reversing conveyor (15) is provided that at the transition between the upward conveyor (15) and the transport path (11) a box guide (32) is provided which forms at least one sliding element, for example formed by at least one slide rail (33), for the side of the boxes (2, 2a) facing the transport plane, via which the boxes (2, 2a) are lifted by the upward conveyor (15 ) slide on the transport plane (TE) of the transport route (11) and that extends with one end at least to an exit of the upward conveyor (15) and is arranged with another end in the region of the transport route, and that the sliding element (33) is on it one end is adjustable relative to the transport plane by a second adjusting device (38, 40). Device according to one of the preceding claims, characterized in that at least two transport or conveyor lines (9, 10, 11) are formed in the housing (3) and are connected to one another via an upward or reversing conveyor (14, 15) formed by a clamping jaw conveyor whose conveying width can be changed by adjusting the distance between the two elements (43, 44) of the respective jaw conveyor (14, 15), that a third adjusting device (46) is provided with which the lateral guide railing (13) at least one of the conveying sections (10 , 11) with the elements of the jaw conveyor (43, 44) are adjustable. Device according to one of the preceding claims, characterized in that the adjusting or lifting device (18) has at least one lifting or pushing element, for example in the form of a rail (19), which extends on the side of the guide element (17) facing away from the conveying plane, that the guide element (17) is held on the lifting element (19) by means of at least one connecting member (23) formed by a chain, a belt, a rope, a band or the like, ) or a guide element provided on a frame element (20), for example guided over at least one roller (21) such that when the lifting element (19) is moved in the longitudinal direction relative to the at least one deflection element (21), the adjusting element (23) adjusts the guide element (17) takes place relative to the transport plane,
the lifting element (19) being movable, for example, in an axial direction parallel to the transport direction (A) for the adjustment of the guide element (17, 17a), and / or
wherein, for example, at least two connecting links (23) are held at one end on the lifting element (19), the other ends of which are attached to the guide element (17) and of which each connecting link (23) does not have at least one with the lifting element (19) moving deflection element (21) is guided. Device according to one of the preceding claims, characterized in that in the region of each end of the guide element (17) there is in each case a connecting member (23) engaging on this guide element. Device according to one of the preceding claims, characterized in that the lifting element (19) rests on the at least one deflecting element (21). Device according to one of the preceding claims, characterized in that the lifting element (19), at least in the region in which it rests on the deflecting element (21) via its adjusting stroke, has a recess which is open at least towards this deflecting element (21), within the one end of the connecting member (23) is attached, and / or
that the lifting element (19) has a U-shaped or C-shaped cross section, and / or that the at least one deflection element (21) has at least one recess, for example a groove-shaped recess for receiving the connecting member (23) and outside the recess at least one contact surface for the lifting element (19). Device according to one of the preceding claims, characterized in that the at least one transport path (9, 10, 11) is a horizontal or approximately horizontal transport path . Device according to one of the preceding claims, characterized in that the sliding element (33) is adjustable at one end by the second adjusting device (38, 40) at least in one axial direction perpendicular to the transport plane relative to the latter, and / or
that the sliding element (33) is held at its other end about an axis perpendicular to the conveying direction (A) and parallel to the transport plane. Device according to one of the preceding claims, characterized in that at least one first conveyor section (10) preceding the upward or reversing conveyor (15) in the conveying direction (A) and at least one second following the upward or reversing conveyor (15) in the transport direction (A) Conveyor line (11) are provided, and that the adjusting device (18) for the guide element (17, 17a) of the first conveyor line (10) is connected in terms of drive to the adjusting device (38, 40) for the box guide (32), which transitions between forms the outlet of the upward or turning conveyor (15) and the second transport path (11). Device according to one of the preceding claims, characterized in that the third adjusting device is formed by a lever arrangement (46) which, for example, consists of a first lever (47) which projects obliquely from the guide rail (13) over the outside thereof and which is at one end on the guide rail and is articulated at the other end to the housing or a frame element (20) of the housing, and consists of a control lever (51) which connects the first lever (47) in an articulated manner to a jaw support frame (43). Device according to one of the preceding claims, characterized in that the guide railing (13) is held in the housing or on frame elements (20) of the housing via at least two first levers (47).

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